Mold core assembly and sliding element

ABSTRACT

The prevent invention provides a mold core assembly and a slidable element. The mold core assembly is used to form a partial shape of the sliding element applied to a zipper head assembly structure. The mold core assembly includes a first mold core structure and a second mold core structure. The first mold core structure has two first lateral structure bodies and a first middle structure body disposed between the two first lateral structure bodies. The first middle structure body has two first extending portions. The second mold core structure has two second lateral structure bodies and a second middle structure body disposed between the two second lateral structure bodies. The second middle structure body has two second extending portions corresponding to each other. Each first extending portion has a nonuniform thickness, and each second extending portion has a nonuniform thickness.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The instant disclosure relates to a mold core assembly and a slidingelement, and more particularly to a mold core assembly for forming apartial shape of a sliding element and a sliding element applied to azipper head assembly structure.

2. Description of Related Art

In general, zippers are basic elements in clothing or accessories.Compared to buttons, zippers are easier to use. A conventional zippercomprises a zipper head and a tape. The zipper head works with the tapeto allow the pulling action. The zipper has been used commonly forclothing, pants, backpack, and other accessories.

SUMMARY OF THE INVENTION

One aspect of the instant disclosure relates to a mold core assembly anda sliding element.

One of the embodiments of the instant disclosure provides a mold coreassembly for forming a partial shape of a sliding element of a zipperhead assembly structure, the sliding element having a base portion, twolateral wall portions, and a seat portion, the two lateral wall portionsrespectively upwardly extended from two opposite lateral sides of thebase portion, the two lateral wall portions corresponding to each otherand connected to a front side of the base portion, the seat portiondisposed on the base portion and connected to a back side of the baseportion, the seat portion having a main body disposed on the baseportion and connected to the back side of the base portion, two stripconvex ribs respectively disposed on two opposite sides of the mainbody, and two concave spaces respectively connected to the two stripconvex ribs and respectively partially surrounding the two strip convexribs, characterized in that the mold core assembly comprises a firstmold core structure and a second mold core structure. The first moldcore structure has a first base body, two first lateral structure bodiesextended from the first base body and opposite to each other, and afirst middle structure body extended from the first base body anddisposed between the two first lateral structure bodies. The firstmiddle structure body has two first extending portions opposite to eachother, and each first extending portion has a first basis portion andtwo first thickening portions inwardly projected from the first basisportion. The second mold core structure has a second base body, twosecond lateral structure bodies extended from the second base body andopposite to each other, and a second middle structure body extended fromthe second base body and disposed between the two second lateralstructure bodies. The second middle structure body has two secondextending portions opposite to each other, and each second extendingportion has a second basis portion and two second thickening portionsinwardly projected from the second basis portion. The two firstextending portions of the first middle structure body are respectivelyconnected to the two second extending portions of the second middlestructure body, and a partial shape of the seat portion is formed bymatching the two first extending portions of the first middle structurebody of the first mold core structure and the two second extendingportions of the second middle structure body of the second mold corestructure. The two first thickening portions of one of the two firstextending portions respectively faces the two first thickening portionsof another one of the two first extending portions, the first basisportion has a first basis thickness, the first thickening portion has afirst thickening thickness, and the first thickening thickness of thefirst thickening portion is larger than the first basis thickness of thefirst basis portion. The two second thickening portions of one of thetwo second extending portions respectively faces the two secondthickening portions of another one of the two second extending portions,the second basis portion has a second basis thickness, the secondthickening portion has a second thickening thickness, and the secondthickening thickness of the second thickening portion is larger than thesecond basis thickness of the second basis portion.

Another one of the embodiments of the instant disclosure provides a moldcore assembly for forming a partial shape of a sliding element of azipper head assembly structure, the sliding element having a baseportion, two lateral wall portions, and a seat portion, the two lateralwall portions respectively upwardly extended from two opposite lateralsides of the base portion, the two lateral wall portions correspondingto each other and connected to a front side of the base portion, and theseat portion disposed on the base portion and connected to a back sideof the base portion, characterized in that the mold core assemblycomprises a first mold core structure and a second mold core structure.The first mold core structure has a first base body, two first lateralstructure bodies extended from the first base body and opposite to eachother, and a first middle structure body extended from the first basebody and disposed between the two first lateral structure bodies, andthe first middle structure body has two first extending portionsopposite to each other, and each first extending portion has anonuniform thickness. The second mold core structure has a second basebody, two second lateral structure bodies extended from the second basebody and opposite to each other, and a second middle structure bodyextended from the second base body and disposed between the two secondlateral structure bodies, and the second middle structure body has twosecond extending portions opposite to each other, and each secondextending portion has a nonuniform thickness. The two first extendingportions of the first middle structure body are respectively connectedto the two second extending portions of the second middle structurebody, and a partial shape of the seat portion is formed by matching thetwo first extending portions of the first middle structure body of thefirst mold core structure and the two second extending portions of thesecond middle structure body of the second mold core structure.

Yet another one of the embodiments of the instant disclosure provides asliding element, comprising a base portion, two lateral wall portions,and a seat portion. The base portion has a front side and a back side.The two lateral wall portions are respectively upwardly extended fromtwo opposite lateral sides of the base portion, and the two lateral wallportions correspond to each other and are connected to the front side ofthe base portion. The seat portion is disposed on the base portion andconnected to the back side of the base portion, and a partial shape ofthe base portion is formed by matching the first middle structure bodyand the second middle structure body of the mold core assembly. The seatportion has a main body disposed on the base portion and connected tothe back side of the base portion, two strip convex ribs respectivelydisposed on two opposite sides of the main body, and two concave spacesrespectively connected to the two strip convex ribs.

Therefore, each first extending portion has a nonuniform thickness andeach second extending portion has a nonuniform thickness, and the seatportion has a main body disposed on the base portion and connected tothe back side of the base portion, two strip convex ribs respectivelydisposed on two opposite sides of the main body, and two concave spacesrespectively connected to the two strip convex ribs. Therefore, theusage life of the mold core assembly can be increased, and theproduction yield of the sliding element can be increased and themanufacturing cost of the sliding element can be decreased.

To further understand the techniques, means and effects of the instantdisclosure, the following detailed descriptions and appended drawingsare hereby referred to, such that, and through which, the purposes,features and aspects of the instant disclosure can be thoroughly andconcretely appreciated. However, the appended drawings are providedsolely for reference and illustration, without any intention to limitthe instant disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a furtherunderstanding of the instant disclosure, and are incorporated in andconstitute a part of this specification. The drawings illustrateexemplary embodiments of the instant disclosure and, together with thedescription, serve to explain the principles of the instant disclosure.

FIG. 1 shows a perspective, schematic view of the first mold corestructure according to the instant disclosure;

FIG. 2 shows another perspective, schematic view of the first mold corestructure according to the instant disclosure;

FIG. 3 shows a perspective, schematic view of the second mold corestructure according to the instant disclosure;

FIG. 4 shows another perspective, schematic view of the second mold corestructure according to the instant disclosure;

FIG. 5 shows a perspective, assembly, schematic view of the first moldcore structure mated with the second mold core structure according tothe instant disclosure;

FIG. 6 shows a cross-sectional view taken along the section line VI-VIof FIG. 5;

FIG. 7 shows a cross-sectional view taken along the section line VII-VIIof FIG. 5;

FIG. 8 shows a perspective, exploded, schematic view of the first moldcore structure and the second mold core structure according to theinstant disclosure;

FIG. 9 shows a lateral, schematic view of the sliding element accordingto the instant disclosure;

FIG. 10 shows another lateral, schematic view of the sliding elementaccording to the instant disclosure;

FIG. 11 shows a rear, schematic view of the sliding element according tothe instant disclosure;

FIG. 12 shows a perspective, assembly, schematic view of the zipper headassembly structure according to the instant disclosure;

FIG. 13 shows a schematic view of the shape of the main body and thestrip rib formed by matching two first extending portions and two secondextending portions according to the instant disclosure;

FIG. 14 shows a schematic view of the shape of the main body and thestrip rib formed by matching a first extending portion and a secondextending portion according to an embodiment of the instant disclosure;

FIG. 15 shows a schematic view of the shape of the main body and thestrip rib formed by matching a first extending portion and a secondextending portion according to another embodiment of the instantdisclosure; and

FIG. 16 shows a schematic view of the shape of the main body and thestrip rib formed by matching a first extending portion and a secondextending portion according to yet another embodiment of the instantdisclosure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The embodiments of a mold core assembly and a sliding element of theinstant disclosure are described. Other advantages and objectives of theinstant disclosure can be easily understood by one skilled in the artfrom the disclosure. The instant disclosure can be applied in differentembodiments. Various modifications and variations can be made to variousdetails in the description for different applications without departingfrom the scope of the instant disclosure. The drawings of the instantdisclosure are provided only for simple illustrations, but are not drawnto scale and do not reflect the actual relative dimensions. Thefollowing embodiments are provided to describe in detail the concept ofthe instant disclosure, and are not intended to limit the scope thereofin any way.

Referring to FIG. 1 to FIG. 11, the instant disclosure provides a moldcore assembly M for forming a partial shape of a sliding element 3 of azipper head assembly structure Z. The sliding element 3 has a baseportion 30, two lateral wall portions 31, and a seat portion 32. The twolateral wall portions 31 are respectively upwardly extended from twoopposite lateral sides of the base portion 30, the two lateral wallportions 31 correspond to each other and are connected to a front side301 of the base portion 30, and the seat portion 32 is disposed on thebase portion 30 and connected to a back side 302 of the base portion 30.In addition, the seat portion 32 has a main body 321 disposed on thebase portion 30 and connected to the back side 302 of the base portion30, two strip convex ribs 322 respectively disposed on two oppositesides of the main body 321, and two concave spaces 323 respectivelyconnected to the two strip convex ribs 322 and respectively partiallysurrounds the two strip convex ribs 322.

Referring to FIG. 1 to FIG. 8, the mold core assembly M includes a firstmold core structure 1 and a second mold core structure 2.

First, referring to FIG. 1 and FIG. 2, the first mold core structure 1has a first base body 10, two first lateral structure bodies 11 extendedfrom the first base body 10 and opposite to each other, and a firstmiddle structure body 12 extended from the first base body 10 anddisposed between the two first lateral structure bodies 11. In addition,the first middle structure body 12 has two first extending portions 120opposite to each other, and each first extending portion 120 has a firstbasis portion 120A and two first thickening portions 120B inwardlyprojected from the first basis portion 120A. Therefore, the structuralstrength of the first extending portion 120 can be increased due to thetwo corresponding first thickening portions 120B, so that the usage lifeof the mold core assembly M can be increased, and the production yieldof the sliding element 3 can be increased and the manufacturing cost ofthe sliding element 3 can be decreased.

Following the above description, the two first thickening portions 120Bof one of the two first extending portions 120 respectively face the twofirst thickening portions 120B of another one of the two first extendingportions 120. In addition, the first basis portion 120A has a firstbasis thickness T11, the first thickening portion 120B has a firstthickening thickness T12, and the first thickening thickness T12 of thefirst thickening portion 120B is larger than the first basis thicknessT11 of the first basis portion 120A. That is to say, each firstextending portion 120 has a nonuniform thickness. Moreover, the firstmiddle structure body 12 has a first major receiving space R10 formedbetween the two first extending portions 120, each first extendingportion 120 has a first minor receiving space R11 formed between the twocorresponding first thickening portions 120B, and the first majorreceiving space R10 is communicated between the two first minorreceiving spaces R11 of the two first extending portions 120.

Furthermore, referring to FIG. 3 and FIG. 4, the second mold corestructure 2 has a second base body 20, two second lateral structurebodies 21 extended from the second base body 20 and opposite to eachother, and a second middle structure body 22 extended from the secondbase body 20 and disposed between the two second lateral structurebodies 21. In addition, the second middle structure body 22 has twosecond extending portions 220 opposite to each other, and each secondextending portion 220 has a second basis portion 220A and two secondthickening portions 220B inwardly projected from the second basisportion 220A. Therefore, the structural strength of the second extendingportion 220 can be increased due to the two corresponding secondthickening portions 220B, so that the usage life of the mold coreassembly M can be increased, and the production yield of the slidingelement 3 can be increased and the manufacturing cost of the slidingelement 3 can be decreased.

Following the above description, the two second thickening portions 220Bof one of the two second extending portions 220 respectively face thetwo second thickening portions 220B of another one of the two secondextending portions 220. In addition, the second basis portion 220A has asecond basis thickness T21, the second thickening portion 220B has asecond thickening thickness T22, and the second thickening thickness T22of the second thickening portion 220B is larger than the second basisthickness T21 of the second basis portion 220A. That is to say, eachsecond extending portion 220 has a nonuniform thickness. Furthermore,the second middle structure body 22 has a second major receiving spaceR20 formed between the two second extending portions 220, each secondextending portion 220 has a second minor receiving space R21 formedbetween the two corresponding second thickening portions 220B, thesecond major receiving space R20 is communicated with the first majorreceiving space R10 and communicated between the two second minorreceiving spaces R21 of the two second extending portions 220, and thetwo second minor receiving spaces R21 of the two second extendingportions 220 are respectively communicated with the two first minorreceiving spaces R11 of the two first extending portions 120.

Furthermore, referring to FIG. 1, FIG. 3, and FIG. 5 to FIG. 8, the twofirst extending portions 120 of the first middle structure body 12 arerespectively connected to the two second extending portions 220 of thesecond middle structure body 22, and a partial shape of the seat portion32 can be formed by matching the two first extending portions 120 of thefirst middle structure body 12 of the first mold core structure 1 andthe two second extending portions 220 of the second middle structurebody 22 of the second mold core structure 2.

More particularly, the main body 321 of the seat portion 32 cancorrespond to the first major receiving space R10 and the second majorreceiving space R20, so that the shape of the main body 321 of the seatportion 32 can be formed by matching the first major receiving space R10and the second major receiving space R20.

More particularly, each strip convex rib 322 can correspond to the firstminor receiving space R11 of the corresponding first extending portion120 and the second minor receiving space R21 of the corresponding secondextending portion 220, so that the shape of each strip convex rib 322can be formed by matching the first minor receiving space R11 of thecorresponding first extending portion 120 and the second minor receivingspace R21 of the corresponding second extending portion 220.

More particularly, each concave space 323 can correspond to the twofirst thickening portions 120B of the corresponding first extendingportion 120 and the two second thickening portions 220B of thecorresponding second extending portion 220, so that the shape of eachconcave space 323 can be formed by matching the two first thickeningportions 120B of the corresponding first extending portion 120 and thetwo second thickening portions 220B of the corresponding secondextending portion 220.

Therefore, referring to FIG. 9 to FIG. 12, the instant disclosureprovides a zipper head assembly structure Z, comprising: a slidingelement 3 (such as a sliding head, or a slide fastener head), aretaining element 4 (such as a hook body or a horse-like hook), and apulling element 5 (such as a pull tab or a pull piece).

First, referring to FIG. 9 to FIG. 11, the sliding element 3 has a baseportion 30, two lateral wall portions 31, and a seat portion 32. The twolateral wall portions 31 are respectively upwardly extended from twoopposite lateral sides of the base portion 30, and the two lateral wallportions 31 correspond to each other and are connected to a front side301 of the base portion 30. In addition, the seat portion 32 is disposedon the base portion 30 and connected to a back side 302 of the baseportion 30, and the seat portion 32 has a positioning passing hole 320formed between the two lateral wall portions 31 as shown in FIG. 8.Moreover, the seat portion 32 has a main body 321 disposed on the baseportion 30 and connected to the back side 302 of the base portion 30,two strip convex ribs 322 respectively disposed on two opposite sides ofthe main body 321, and two concave spaces 323 respectively connected tothe two strip convex ribs 322. Please note, the two concave spaces 323are respectively concaved from two opposite sides of the main body 321,so that the metal material used for forming the shape of the seatportion 32 can be reduced so as to reduce the manufacturing cost of thesliding element 3.

Moreover, referring to FIG. 8 and FIG. 12, the retaining element 4 ismovably disposed on the seat portion 32, and the retaining element 4 hasa positioning portion 40 disposed on an end portion thereof and passingthrough the positioning passing hole 320. In addition, the pullingelement 5 is movably mated with the retaining element 4.

More particularly, referring to FIG. 9 to FIG. 11, the base portion 30of the sliding element 3 has a micro protrusion 303 projected from aninner surface 300 thereof, the micro protrusion 303 is connected to themain body 321 of the seat portion 32 and partially surrounds the mainbody 321 of the seat portion 32, and the two concave spaces of the seatportion and the micro protrusion of the base portion are formed into Ushapes. In addition, the seat portion 32 has a carrier 324 disposed onthe main body 321 and separated from the base portion 30 and two recessspaces R30 formed between the micro protrusion 303 and the carrier 324,the two recess spaces R30 are respectively communicated with the twoconcave spaces 323, and the two strip convex ribs 322 are respectivelytotally received in the two recess spaces R30.

In conclusion, referring to FIG. 13, the shape of the main body 321 ofthe seat portion 32 and the shape of each strip convex rib 322 can beformed by matching the two first extending portions 120 of the firstmiddle structure body 12 of the first mold core structure 1 and the twosecond extending portions 220 of the second middle structure body 22 ofthe second mold core structure 2. With regard to the first mold corestructure 1, each first extending portion 120 has a first basis portion120A and two first thickening portions 120B, and the first thickeningthickness T12 of the first thickening portion 120B is larger than thefirst basis thickness T11 of the first basis portion 120A. With regardto the second mold core structure 2, each second extending portion 220has a second basis portion 220A and two second thickening portions 220B,and the second thickening thickness T22 of the second thickening portion220B is larger than the second basis thickness T21 of the second basisportion 220A. Therefore, the structural strength of the first extendingportion 120 and the second extending portion 220 can be increased due tothe two corresponding first thickening portions 120B and the twocorresponding second thickening portions 220B, so that the usage life ofthe mold core assembly M can be increased, and the production yield ofthe sliding element 3 can be increased and the manufacturing cost of thesliding element 3 can be decreased.

More particularly, referring to FIG. 14 to FIG. 16, the different fromFIG. 14 (or FIG. 15, or FIG. 16) to FIG. 13 is as follows: referring toFIG. 14 to FIG. 16, each first extending portion 120 has a first basisportion 120A and at least one first thickening portion 120B inwardlyprojected from the first basis portion 120A, and each second extendingportion 220 has a second basis portion 220A and at least one secondthickening portion 220B inwardly projected from the second basis portion220A. In addition, the at least one first thickening portion 120B of oneof the two first extending portions 120 faces the at least one firstthickening portion 120B of another one of the two first extendingportions 120, and the at least one second thickening portion 220B of oneof the two second extending portions 220 faces the at least one secondthickening portion 220B of another one of the two second extendingportions 222. That is to say, one embodiment of the instant disclosurecan use only a first thickening portion 120B inwardly projected from theoutermost portion (as shown in FIG. 14 and FIG. 15) or the middleportion (as shown in FIG. 16) of the first basis portion 120A, and useonly a second thickening portion 220B inwardly projected from theoutermost portion (as shown in FIG. 14 and FIG. 15) or the middleportion (as shown in FIG. 16) of the second basis portion 220A.

In conclusion, each first extending portion 120 has a nonuniformthickness and each second extending portion 220 has a nonuniformthickness, and the seat portion 32 has a main body 321 disposed on thebase portion 30 and connected to the back side 302 of the base portion30, two strip convex ribs 322 respectively disposed on two oppositesides of the main body 321, and two concave spaces 323 respectivelyconnected to the two strip convex ribs 322. Therefore, the usage life ofthe mold core assembly M can be increased, and the production yield ofthe sliding element 3 can be increased and the manufacturing cost of thesliding element 3 can be decreased. That is to say, the structuralstrength of the first extending portion 120 and the second extendingportion 220 can be increased due to the two corresponding firstthickening portions 120B and the two corresponding second thickeningportions 220B, so that the usage life of the mold core assembly M can beincreased, and the production yield of the sliding element 3 can beincreased and the manufacturing cost of the sliding element 3 can bedecreased.

The aforementioned descriptions merely represent the preferredembodiments of the instant disclosure, without any intention to limitthe scope of the instant disclosure which is fully described only withinthe following claims. Various equivalent changes, alterations ormodifications based on the claims of the instant disclosure are all,consequently, viewed as being embraced by the scope of the instantdisclosure.

What is claimed is:
 1. A mold core assembly for forming a partial shapeof a sliding element of a zipper head assembly structure, the slidingelement having a base portion, two lateral wall portions, and a seatportion, the two lateral wall portions respectively upwardly extendedfrom two opposite lateral sides of the base portion, the two lateralwall portions corresponding to each other and connected to a front sideof the base portion, the seat portion disposed on the base portion andconnected to a back side of the base portion, the seat portion having amain body disposed on the base portion and connected to the back side ofthe base portion, two strip convex ribs respectively disposed on twoopposite sides of the main body, and two concave spaces respectivelyconnected to the two strip convex ribs and respectively partiallysurrounding the two strip convex ribs, characterized in that the moldcore assembly comprises: a first mold core structure having a first basebody, two first lateral structure bodies extended from the first basebody and opposite to each other, and a first middle structure bodyextended from the first base body and disposed between the two firstlateral structure bodies, wherein the first middle structure body hastwo first extending portions opposite to each other, and each firstextending portion has a first basis portion and two first thickeningportions inwardly projected from the first basis portion; and a secondmold core structure having a second base body, two second lateralstructure bodies extended from the second base body and opposite to eachother, and a second middle structure body extended from the second basebody and disposed between the two second lateral structure bodies,wherein the second middle structure body has two second extendingportions opposite to each other, and each second extending portion has asecond basis portion and two second thickening portions inwardlyprojected from the second basis portion; wherein the two first extendingportions of the first middle structure body are respectively connectedto the two second extending portions of the second middle structurebody, and a partial shape of the seat portion is formed by matching thetwo first extending portions of the first middle structure body of thefirst mold core structure and the two second extending portions of thesecond middle structure body of the second mold core structure; whereinthe two first thickening portions of one of the two first extendingportions respectively facing the two first thickening portions ofanother one of the two first extending portions, the first basis portionhas a first basis thickness, the first thickening portion has a firstthickening thickness, and the first thickening thickness of the firstthickening portion is larger than the first basis thickness of the firstbasis portion; wherein the two second thickening portions of one of thetwo second extending portions respectively facing the two secondthickening portions of another one of the two second extending portions,the second basis portion has a second basis thickness, the secondthickening portion has a second thickening thickness, and the secondthickening thickness of the second thickening portion is larger than thesecond basis thickness of the second basis portion.
 2. The mold coreassembly of claim 1, wherein the first middle structure body has a firstmajor receiving space formed between the two first extending portions,each first extending portion has a first minor receiving space formedbetween the two corresponding first thickening portions, and the firstmajor receiving space is communicated between the two first minorreceiving spaces of the two first extending portions, wherein the secondmiddle structure body has a second major receiving space formed betweenthe two second extending portions, each second extending portion has asecond minor receiving space formed between the two corresponding secondthickening portions, the second major receiving space is communicatedwith the first major receiving space and communicated between the twosecond minor receiving spaces of the two second extending portions, andthe two second minor receiving spaces of the two second extendingportions are respectively communicated with the two first minorreceiving spaces of the two first extending portions.
 3. The mold coreassembly of claim 2, wherein the main body of the seat portioncorresponds to the first major receiving space and the second majorreceiving space, and the shape of the main body of the seat portion isformed by matching the first major receiving space and the second majorreceiving space.
 4. The mold core assembly of claim 2, wherein eachstrip convex rib corresponds to the first minor receiving space of thecorresponding first extending portion and the second minor receivingspace of the corresponding second extending portion, and the shape ofeach strip convex rib is formed by matching the first minor receivingspace of the corresponding first extending portion and the second minorreceiving space of the corresponding second extending portion.
 5. Themold core assembly of claim 2, wherein each concave space corresponds tothe two first thickening portions of the corresponding first extendingportion and the two second thickening portions of the correspondingsecond extending portion, and the shape of each concave space is formedby matching the two first thickening portions of the corresponding firstextending portion and the two second thickening portions of thecorresponding second extending portion.
 6. A mold core assembly forforming a partial shape of a sliding element of a zipper head assemblystructure, the sliding element having a base portion, two lateral wallportions, and a seat portion, the two lateral wall portions respectivelyupwardly extended from two opposite lateral sides of the base portion,the two lateral wall portions corresponding to each other and connectedto a front side of the base portion, and the seat portion disposed onthe base portion and connected to a back side of the base portion,characterized in that the mold core assembly comprises: a first moldcore structure having a first base body, two first lateral structurebodies extended from the first base body and opposite to each other, anda first middle structure body extended from the first base body anddisposed between the two first lateral structure bodies, wherein thefirst middle structure body has two first extending portions opposite toeach other, and each first extending portion has a nonuniform thickness;and a second mold core structure having a second base body, two secondlateral structure bodies extended from the second base body and oppositeto each other, and a second middle structure body extended from thesecond base body and disposed between the two second lateral structurebodies, wherein the second middle structure body has two secondextending portions opposite to each other, and each second extendingportion has a nonuniform thickness; wherein the two first extendingportions of the first middle structure body are respectively connectedto the two second extending portions of the second middle structurebody, and a partial shape of the seat portion is formed by matching thetwo first extending portions of the first middle structure body of thefirst mold core structure and the two second extending portions of thesecond middle structure body of the second mold core structure.
 7. Themold core assembly of claim 6, wherein each first extending portion hasa first basis portion and at least one first thickening portion inwardlyprojected from the first basis portion, and each second extendingportion has a second basis portion and at least one second thickeningportion inwardly projected from the second basis portion, wherein the atleast one first thickening portion of one of the two first extendingportions faces the at least one first thickening portion of another oneof the two first extending portions, the first basis portion has a firstbasis thickness, the first thickening portion has a first thickeningthickness, and the first thickening thickness of the first thickeningportion is larger than the first basis thickness of the first basisportion, wherein the at least one second thickening portion of one ofthe two second extending portions faces the at least one secondthickening portion of another one of the two second extending portions,the second basis portion has a second basis thickness, the secondthickening portion has a second thickening thickness, and the secondthickening thickness of the second thickening portion is larger than thesecond basis thickness of the second basis portion.
 8. The mold coreassembly of claim 6, wherein each first extending portion has a firstbasis portion and at least one first thickening portion inwardlyprojected from the first basis portion, and each second extendingportion has a second basis portion and at least one second thickeningportion inwardly projected from the second basis portion, wherein thetwo first thickening portions of one of the two first extending portionsrespectively facing the two first thickening portions of another one ofthe two first extending portions, the first basis portion has a firstbasis thickness, the first thickening portion has a first thickeningthickness, and the first thickening thickness of the first thickeningportion is larger than the first basis thickness of the first basisportion, wherein the two second thickening portions of one of the twosecond extending portions respectively facing the two second thickeningportions of another one of the two second extending portions, the secondbasis portion has a second basis thickness, the second thickeningportion has a second thickening thickness, and the second thickeningthickness of the second thickening portion is larger than the secondbasis thickness of the second basis portion.
 9. A sliding element,comprising: a base portion having a front side and a back side; twolateral wall portions respectively upwardly extended from two oppositelateral sides of the base portion, wherein the two lateral wall portionscorrespond to each other and are connected to the front side of the baseportion; and a seat portion disposed on the base portion and connectedto the back side of the base portion, wherein a partial shape of thebase portion is formed by matching the first middle structure body andthe second middle structure body of the mold core assembly of claim 6;wherein the seat portion has a main body disposed on the base portionand connected to the back side of the base portion, two strip convexribs respectively disposed on two opposite sides of the main body, andtwo concave spaces respectively connected to the two strip convex ribs.10. The sliding element of claim 9, wherein the base portion has a microprotrusion projected from an inner surface thereof, the micro protrusionis connected to the main body of the seat portion and partiallysurrounding the main body of the seat portion, and the two concavespaces of the seat portion and the micro protrusion of the base portionare formed into U shapes.